CVE-2019-11072
CriticalPublic exploitlighttpd before 1.4.54 has a signed integer overflow, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a malicious HTTP GET request, as demonstrated by mishandling of /%2F?
Published Apr 10, 2019 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2019-11072
Key Facts
Patch immediately- CVE-2019-11072 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Lighttpd.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 74% probability of exploitation in the next 30 days.
- Fixed versions are available, including Lighttpd 1.4.53-4, Lighttpd <=1.4.53, Lighttpd 1.4.53.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v3.1
9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
74%
Higher than 99.4% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2019-11072 brief as a PDF
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Description
lighttpd before 1.4.54 has a signed integer overflow, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a malicious HTTP GET request, as demonstrated by mishandling of /%2F? in burl_normalize_2F_to_slash_fix in burl.c. NOTE: The developer states "The feature which can be abused to cause the crash is a new feature in lighttpd 1.4.50, and is not enabled by default. It must be explicitly configured in the config file (e.g. lighttpd.conf). Certain input will trigger an abort() in lighttpd when that feature is enabled. lighttpd detects the underflow or realloc() will fail (in both 32-bit and 64-bit executables), also detected in lighttpd. Either triggers an explicit abort() by lighttpd. This is not exploitable beyond triggering the explicit abort() with subsequent application exit.
Affected Products
12 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| LighttpdLighttpd | See advisory | 1.4.53 |
Patched Releases
Lighttpd
1.4.53-4, <=1.4.53
Timeline
Publicly disclosed
Apr 10, 2019
Last updated
Aug 4, 2026
Weakness Type
- CWE-190 Integer Overflow or Wraparound
References
FAQ
Common Questions.
lighttpd before 1.4.54 has a signed integer overflow, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a malicious HTTP GET request, as demonstrated by mishandling of /%2F?
Affected: Lighttpd. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Lighttpd 1.4.53-4, Lighttpd <=1.4.53, Lighttpd 1.4.53.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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